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Topic Review (Newest First)

02-16-2020 06:17 PM

miyami

While this shows that there are differences in the CDIs, it also shows that all of them are not functioning, since I do not get the 100V minimum peak at the ignition coil. And to be sure for these tests, I disconnected all b/w (nanny wires) in the handle bar to guarantee the run/stop switch and the ignition switch are not at fault, and also grounded the green/white wire to exclude the side stand switch from being the culprit.

With this, I went through all the trouble shouting items in the rebel 250 official repair manual (page 16-3), and it points to a faulty CDI.

This leaves me puzzled. Unless all 3 CDIs are toast, or there is a special version needed for this bike, it stops making sense to me.

I am almost at the end of my wisdom and am thinking of bringing the bike to a Honda shop this week, unless somebody has some last advice.

Some more tests:
I did verify all connections in the harness. Everything looks good and is connected as it should. No groundings or open connections as far as I can see.

- I did pull the stator and it looks nice and clean (image 1). Not bad for a 29000 mile bike.

- I took a strong magnet and moved it in front of both exciter windings individually, and could see responses in the oscilloscope, so I assume the exciter coil is ok.
- I did some more measurements of the exciter coil and pulse coil after putting everything back together and it looks in spec (exciter coil: image 2 and 3, pulse coil: image 3; all with CDI not connected.
- Then I had a closer look again at the 3 CDI boxes I have. I installed the CDI one after the other and got some kind of weird readings.

02-14-2020 07:20 PM

miyami

Sorry, SoakedKarma. I just saw your post right after posting my previous one....

The wiring harness only shows one grounding point (top middle) that attaches to the Rectifier mount. Is this the only point where a cable is attached to the frame (ground) ? SoakedKarma's ignition system wiring has 2 Ground points.

Are there any particular grounding points to look for other than the green wire at the CDI and at the ignition coils primary side ? I thought the rest is all grounded through chassis attachment screws (e.g. stator, spark plugs, etc.)?